Firstly, add x+y=-10 and 2x-y=-8 to get [tex] 3x=-18 [/tex] . From here you can solve for x.
For this, all you need to do is divide 3 on each side, and your answer will be [tex] x=-6 [/tex]
To solve for y, just replace x for -6 in either equation and solve.
[tex] -6+y=-10\\ y=-4 [/tex]
In short, x = -6 and y = -4.
